提高飞机壁板低频宽带隔声的层合声学超材料

doi:10.7527/S1000-6893.2020.24785

Abstract

Abstract: Aiming at the problem of low-frequency broadband noise control in the aircraft cabin, a laminated acoustic metamaterial, which is suitable for sound insulation enhancement of aircraft wall panels, is proposed. The laminated acoustic metamaterial is composed of two membrane-constrained acoustic metamaterial panels with different composition parameters in the front and the back, and a porous sound-absorbing material filled in them. By establishing the sound insulation calculating finite element model of laminated acoustic metamaterials, analyzing the relationship between the sound insulation characteristics of each layer of membrane-constrained acoustic metamaterials and the laminated acoustic metamaterials composed of them. And focusing on the mechanism of negative mass effect of laminated acoustic metamaterials on its sound insulation characteristics. Based on the four-microphone acoustic impedance tube test system, the normal incident sound insulation of the laminated acoustic metamaterial is measured to verify the validity of the finite element model. Finally, the insertion loss test of the large-size laminated acoustic metamaterial was carried out in the semi-cancellation chamber. The results showed that the average insertion loss of the laminated acoustic metamaterial samples with an areal density of 1.5 kg/m² in the low-frequency operating frequency range of 100-500 Hz reaches 14 dB, which reflected the excellent low-frequency broadband sound insulation capability. The research has certain theoretical and engineering guidance value for using thin and light acoustic metamaterials to improve the low-frequency broadband sound insulation performance of aircraft wall panels.

Key words: acoustic metamaterial, aircraft siding, noise control, sound insulation characteristics, laminated materials, low-frequency noise

CLC Number:

V214.8
TB535

GU Jintao, WANG Xiaole, TANG Youheng, ZHOU Jie, HUANG Zhenyu. Laminated acoustic metamaterial for improving low-frequency broadband sound insulation of aircraft wall panels[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(1): 224785-224785.

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Laminated acoustic metamaterial for improving low-frequency broadband sound insulation of aircraft wall panels

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